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Outdoor Free Flight Forum => Dimescale / Pseudo-Dimescale => Topic started by: Yak 52 on December 27, 2013, 09:34:39 AM



Title: Dart Kitten
Post by: Yak 52 on December 27, 2013, 09:34:39 AM
Here's my pseudo-dime scale Dart Kitten nearly ready to cover. The scan shows the rough plan but it will be finished if the thing flies.

Weight of the bones was 3.7g but it needs to be light as the wing area is a bit limited. In fact the fuselage is more like peanut size.

Jon


Title: Re: Dart Kitten
Post by: Dave Andreski on December 27, 2013, 10:49:24 AM
Hi Jon,
The Dart Kitten is a very pretty aircraft and your Model will be a head turner.
Dave


Title: Re: Dart Kitten
Post by: FreeFlightModeller on December 27, 2013, 04:00:51 PM
Beautiful work Jon - would make a nice little kit  :)


Title: Re: Dart Kitten
Post by: OZPAF on December 27, 2013, 04:08:53 PM
i agree with Dave - very attractive aircraft and model. I like the dihedral break being outside the fuselage as per fullsize - it looks practical - combining the undercarriage and dihedral strong points in one area.

The exhaust on the fullsize looks very British ;D The forward mounted pipe facing down with the brace behind it.

John


Title: Re: Dart Kitten
Post by: mightygoo on December 27, 2013, 04:20:43 PM
'Near' perfection as always Jon!   ;)
Looking forward to seeing this maiden soon!


Title: Re: Dart Kitten
Post by: Yak 52 on December 27, 2013, 06:14:54 PM
Thanks chaps (and welcome to the goo-meister :)). It's not a sleek aircraft but it has a perky, alert look about it and it has simple lines. The engine won't be getting much detail because it's a dimer. But maybe I'll add the exhaust (when I've got it trimmed  :o)


Title: Re: Dart Kitten
Post by: Yak 52 on December 28, 2013, 12:22:31 PM
Got quite a bit done today. The fuselage is covered (pre-shrunk red esaki) and the instrument panel installed. The panel was drawn up in Paint with the help of some flight sim screenshots and then printed small but at high resolution (600dpi)


Title: Re: Dart Kitten
Post by: Balsa Ace on December 28, 2013, 01:00:15 PM
Very nice,and great looking instrument panel too.

Scott


Title: Re: Dart Kitten
Post by: Paul_BB on December 31, 2013, 01:45:35 AM
Meticulous and precise work, lovely model. Congratulations.

-Paul


Title: Re: Dart Kitten
Post by: Yak 52 on December 31, 2013, 09:37:35 AM
Thanks guys. Here's a quick photo of current progress.

The tissue on the fuselage is attached with dope and thinners, which is my preferred method. The silver is done with Pritt Stick (the new formula is more like Uhu) I'm still finding that glue stick slips when I shrink the tissue but I may have overdone the steaming - after all that how you open envelopes  ::)

I will be adding the silver over the red for the rudder and wing roots as this looks better than red on silver.

The nose block is laminated from 3 sheets of 1/4" balsa and sprayed silver.

The UC looks a bit stalky - it's extended slightly to give me about a 5" diameter prop. The tubes are from a cotton bud. The wheels are turned on a drill with an aluminium tube hub. The whole UC/wheel weighs about 0.5g per leg. The legs are sandwiched by a balsa sub rib but I may reinforce the spar in the centre section.

Also shown in the pic is the wing root - the root rib is straight but the fuselage side curves in at the front as per the full size. The side frames were rolled under a pen to get this curve.


Title: Re: Dart Kitten
Post by: OZPAF on December 31, 2013, 05:29:52 PM
Neat as always Jon. Crisp covering and those turned wheels caught my eye. Did you use some sort of form tool? I can't even get simple streamlined wheels symetrical.
John


Title: Re: Dart Kitten
Post by: Yak 52 on January 01, 2014, 06:14:50 AM
Hi John, no form as such. The blanks are cut with an Olfa compass cutter. The inners are 1/16" and the outer 1/32". All the blanks are cut oversize, the inner two are glued together and then I drill the hole for the ali hub - this is almost inevitably off centre as the balsa is soft ::) so I CA the tube hub in (spin on a bit of wire to check alignment), add the rims (by eye) but then use the tube to centre the compass cutter again and trim off some excess. You can't get all of it off with the cutter so I trim the rest with a scalpel using the compass cut as the new outline. This and a few swipes of sand paper gets it round enough to turn in the drill. Not sure if this makes sense in text :-\


Title: Re: Dart Kitten
Post by: OZPAF on January 01, 2014, 04:45:36 PM
Thanks - that does make sense. Using the tube hub as the centre whil turning in the drill is the big advance on my technique. Using a mandrel directly in the balsa doesn't give much support!
John


Title: Re: Dart Kitten
Post by: Yak 52 on January 04, 2014, 01:48:51 PM
All done!  :)

I struggled quite a lot with getting the silver to shrink - it finally did but there are a few wrinkles  :-\ In fact there are quite a few "that'll have to do"s but I just wanted to get it in the air and move on.

Finished weight is 9.4g which gives me a cube loading of 3 and a wingloading of 0.28g/in2. It will need a smidge of nose weight and so the AUW with the motor will be about 11g.

I forgot to mention that the tailplane is scale size - there's a healthy tail volume of 0.55. The prop is a Peck 6" cut down to 5.125".


Should be flying tomorrow  :)


Title: Re: Dart Kitten
Post by: FreeFlightModeller on January 04, 2014, 01:58:29 PM
Very nice Jon .... hopefully will see it flying tomorrow

I can imagine it will float around quite nicely  :)

(the Bushfield meeting is in the afternoon isn't it? .... paranoid that I will turn up to departing crowds!)


Title: Re: Dart Kitten
Post by: Yak 52 on January 04, 2014, 02:04:08 PM
Thanks Russ, yep 2-5pm. Bringing the Tripe?  :)
I should have the BD5 ready again too.


Title: Re: Dart Kitten
Post by: FreeFlightModeller on January 04, 2014, 02:09:16 PM
I hope to Jon .... it's in a fairly 'non-commital' state at the moment. The motor mount plate is just wedged in with Blu-Tac in case I need to make changes!
Hoping that will hold enough to get some trimming done.

Hopefully I will remember the video camera! (don't worry ... I don't do interviews!)



Title: Re: Dart Kitten
Post by: Pete Fardell on January 04, 2014, 05:02:44 PM
Looks lovely, John. Hope for flight pics soon.


Title: Re: Dart Kitten
Post by: Ace Dugan on January 04, 2014, 05:44:48 PM
Jon, that's very very nice.  The colors really make it pop.  Looking forward to the flight report...


Title: Re: Dart Kitten
Post by: Dave Andreski on January 04, 2014, 07:11:56 PM
Jon,
Very nice! the amount of detailing is spot on.
Dave


Title: Re: Dart Kitten
Post by: Monz on January 04, 2014, 08:39:39 PM
Jon, have you tried the silver Hobbycraft tissue yet? Shrinks beautifully, both types.


Title: Re: Dart Kitten
Post by: tross on January 04, 2014, 09:55:58 PM
I think you've done a great job with the silver. :)
It's never been very friendly.
The gear doesn't look stalky at all. ;D
How are the small details on the fin and side of the fuse created?
Well done. Great little plan. :)

Tony


Title: Re: Dart Kitten
Post by: Paul_BB on January 05, 2014, 12:42:11 AM
Lovely plane, nice work.  :)

-Paul


Title: Re: Dart Kitten
Post by: Yak 52 on January 05, 2014, 12:35:56 PM
Thanks guys.

Monique, the tissue is another domestic one labelled 'Presentor' - I haven't tried HC yet but I will. I found it needs a light water misting to shrink it - steam just didn't get it wet enough and was lifting the glue stick.

Tony, the logo on the fuselage was drawn with silver gel pen - a technique I shamelessly pinched from John Ernst. I chickened out of drawing straight on to the fuselage so drew it on red tissue and added it as a tissue decal.

The fin decal is an Air League sticker - the text is printed on white tissue (it's readable but my camera's not up to the macro detail) and the blue flashes of the logo were added with biro.


The flying went ok today. It does have quite a tip stall tendency in spite of washout ;D but that was no surprise. As a result I was flying it faster than any respectable Kitten should! I was using a 9" loop of 3/32 and about 600 turns but it was a bit over powered and so the transition to glide and landing was slightly stally with inevitable wing drop. The odd good flight ended with a landing on the wheels  ::) Next time I'll try a thinner motor.

Russ got some video of it, and his tripe was also going beautifully: once he'd persuaded his pilot that 'stunting' a few inches from the ceiling was not the best idea...  8)


Jon


Title: Re: Dart Kitten
Post by: FreeFlightModeller on January 05, 2014, 02:34:45 PM
The Kitten was going well Jon  :) .... I have plenty of video that might take some time to upload and edit!


Title: Re: Dart Kitten
Post by: FreeFlightModeller on January 05, 2014, 05:24:47 PM
Here's one of Jon's flights with the Dart Kitten.
Looking very good ... Jon knows what adjustments he wishes to make to adjust flying speed and landing as mentioned in his previous post.

http://www.youtube.com/watch?v=8VU9sC5kTVc&feature=youtu.be (http://www.youtube.com/watch?v=8VU9sC5kTVc&feature=youtu.be)


Title: Re: Dart Kitten
Post by: Yak 52 on January 05, 2014, 06:37:09 PM
Thanks for taking that Russ, much appreciated.


Title: Re: Dart Kitten
Post by: OZPAF on January 06, 2014, 01:19:48 AM
Nice stable climb and cruise under power Jon. Perhaps a non scale turbulator strip on the left inside wing tip area(a couple of layers of 1.5mm wide magic tape strips or similar) may help.
John


Title: Re: Dart Kitten
Post by: tross on January 06, 2014, 07:33:50 AM
Flies great under power Jon. :D
I think the pilot got distracted and went hands free! ;D :D :) ;D

Tony



Title: Re: Dart Kitten
Post by: Dave Crompton on January 26, 2014, 03:34:03 PM
Hi Jon,
just seen the pics and the Vids for your Beautiful Dart Kitten and I was very much impressed!! Did you draw up the plans yourself and what is it's span? I must admit i wouldn't mind having a go at buliding this myself.

Cheers for now.

ATB Dave.   :D


Title: Re: Dart Kitten
Post by: Yak 52 on January 26, 2014, 04:51:36 PM
Hi Dave, thanks for the interest. This is my own design (plan just needs finishing when I get around to it) and the span is 16". The wood is all 1/16sq so it would scale up to 24" with 3/32 wood quite nicely. The tail and fin are scale outlines if you are concerned about that sort of thing for comps. If you're interested you're very welcome to it :)

I stripped some rubber and flew it today on 0.080" which gave a slower cruise and a better powered descent. I wet and reset the washout to give less differential (more or less equal on both wings now or perhaps a touch more on the outer) which has cured the wing drop. I didn't get to ROG it but at least I know it's tamed for the next session  ;D


Title: Re: Dart Kitten
Post by: Dave Crompton on January 27, 2014, 05:16:53 PM
Hi Jon,
Yes I'm definitely interested. It's certainly the right size for me. If you could let me have a copy of the plan when your ready that would be great!

Cheers, Dave.   ;D